I would say apple has no domain expertise and they should focus on what they focus on. This is positive news for the "future" no matter how it is seen. It might very well be the largest mistake Apple has ever done and seal its demise or the smartest move and they will be a global dominant company even more so than today...
Apple has more than enough money to try 50 experiments like this.
Surely one would be a TV. Smart TVs right now are woeful, and just providing a weak set-top box on the side might provide something at an accessible price point, but it doesn't solve the real problem.
An ideal smart TV would pre-fetch EPGs to load and switch quickly, have an optional social layer over the video feed (like what Xbox One proposed), and more naturally fit in with other hardware and ways of getting media to the screen.